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Coated anode material and method of preparing the same

a lithium ion battery and anode material technology, applied in the direction of batteries, sustainable manufacturing/processing, cell components, etc., can solve the problem that silicon carbide cannot be used as anode active material alone, and achieve the effects of high flexibility, high strength and good temperature toleran

Active Publication Date: 2019-06-11
MICROVAST ADVANCED MATERIALS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent describes a new type of anode material for lithium batteries that has a high strength and flexibility. The material consists of a coated silicon core that is coated with a carbon shell. This design prevents the silicon from volume changing too much during charging and discharging, which can improve the battery's performance. The carbon shell allows lithium ions to directly enter the silicon core, which leads to better rate performance and a longer battery life.

Problems solved by technology

Therefore, silicon carbide cannot be used as anode active material alone.

Method used

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  • Coated anode material and method of preparing the same
  • Coated anode material and method of preparing the same
  • Coated anode material and method of preparing the same

Examples

Experimental program
Comparison scheme
Effect test

embodiment 1

[0037]Preparing coated anode material: referring to FIGS. 1-2, dissolving 38.4 g naphthaline in 200 ml ethylene glycol dimethyl ether, adding and dispersing 2.0 g silicon carbide (SiC) by ultrasonic dispersion method for 1 h, adding 8.36 g sodium and stirring overnight until the sodium is dissolved to form a dark green solution. Then, adding 12.18 g silicon tetrachloride for reaction and stirring for 2 h. Thereafter, filtering the obtained product, washing it three times by cyclohexane, and drying it. Then, heat treating the product for 3 h under an atmosphere of argon at a temperature of 600° C. As a result, a coated anode material with a core-shell structure is prepared. The core-shell structure includes an inert core and a shell coated on the inert core, wherein the inert core includes a non-active material of silicon carbide (SiC), and the shell includes an anode active material of silicon.

[0038]Preparing coin cell: providing 0.1 g the coated anode material as prepared above, 0....

embodiment 2

[0039]Preparing coated anode material: referring to FIG. 4, dissolving 38.4 g naphthaline in 200 ml ethylene glycol dimethyl ether, adding and dispersing 4.0 g silicon carbide (SiC) by ultrasonic dispersion method for 1 h, adding 8.36 g sodium and stirring overnight until the sodium is dissolved to form a dark green solution. Then, adding 12.18 g silicon tetrachloride for reaction and stirring for 2 h. Thereafter, filtering the obtained product, washing it three times by cyclohexane, and drying it. Then, heat treating the product for 3 h under an atmosphere of argon at a temperature of 600° C. As a result, a coated anode material with a core-shell structure is formed. The core-shell structure includes an inert core and a shell coated on the inert core, wherein the inert core includes a non-active material of silicon carbide (SiC), and the shell includes an anode active material of silicon.

[0040]Preparing coin cell: same as embodiment 1.

[0041]

TABLE 1CoatingInitial dischargingthicknes...

embodiment 3

[0043]Preparing coated anode material: dissolving 38.4 g naphthaline in 200 ml tetrahydrofuran, adding and dispersing 2.0 g silicon carbide (SiC) by ultrasonic dispersion method for 1 h, adding 8.36 g sodium and stirring overnight until the sodium is dissolved to form a dark green solution. Then, adding 12.18 g silicon tetrachloride for reaction and stirring for 2 h. Thereafter, filtering the obtained product, washing it three times by cyclohexane, and drying it. Then, heat treating the product for 10 h under an atmosphere of nitrogen at a temperature of 300° C. As a result, a coated anode material with a core-shell structure is formed. The core-shell structure includes an inert core and a shell coated on the inert core, wherein the inert core includes a non-active material of silicon carbide (SiC), and the shell includes an anode active material of silicon.

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Abstract

The present application provides a coated anode material and a method of preparing the same. The coated anode material has a core-shell structure, wherein the core-shell structure includes an inert core and a shell coated on the inert core, the shell comprises an anode active material, and the inert core comprises a non-active material. In the coated anode material, the anode active material of the shell is distributed over the non-active material of the inert core, and the coated anode material can overcome the volume change problem of silicon particles during lithium insertion / deinsertion to a certain extent and obtain a better cycle performance and rate performance.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]The present application is based on and claims priority of Chinese patent application No. 201510621549.7, filed on Sep. 25, 2015. The entire disclosure of the above-identified application, including the specification, drawings and claims are incorporated herein by reference in its entirety.FIELD OF THE INVENTION[0002]The present application relates to an anode material for a lithium ion battery and a method of preparing the same, and more particularly to a coated anode material for a lithium ion battery and a method of preparing the same.BACKGROUND OF THE INVENTION[0003]Lithium ion batteries (hereinafter referred as “LIB”) are widely used in various kinds of electric appliances, and also used as power energy of electric vehicles, due to the LIB having advantages of higher operating voltage, higher energy density, stable discharge potential, low self discharge, long cycle life, no memory effect and no pollution.[0004]When LIB is used as pow...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H01M10/0525H01M4/36H01M4/1395H01M4/134H01M4/04H01M4/38H01M10/0585H01M4/58C01B33/021H01M4/62H01M10/052H01M4/02
CPCH01M4/623H01M4/62H01M10/0525H01M10/0585H01M4/386C01B33/021H01M4/0402H01M4/0404H01M4/134H01M4/1395H01M4/58H01M4/625H01M4/366H01M10/052H01M2004/021H01M2004/027H01M2220/20H01M2220/30Y02E60/10Y02P70/50
Inventor MATTIS, WENJUAN LIULUO, JIANHAI
Owner MICROVAST ADVANCED MATERIALS INC